#compdef zargs -value-,-default-,-command-

local arguments eofstr pos=$((CURRENT)) numeofs=0 ret=1 cmdpos=1

#this doesn't handle '--' on the command line, only --
#it also by extension doesn't handle eofstr being the empty string
#it also also doesn't handle eofstr being -e or --eof, and everything will
# probably also be confused if the command at the end takes a -e, --eof= or --
eofstr=${${${${words[(r)(--eof=*|-e*)]}#--eof=}#-e}:---}
while {
  pos=$(( words[(b:pos-1:I)$eofstr] ))
  (( numeofs == 0 )) && (( cmdpos = pos ))
  (( pos )) && (( numeofs++ ))
  (( pos ))
} {}
case $numeofs in
  0)
    #zargs arguments
    arguments=(
      '(--eof -e)'{--eof=,-e+}'[change the end-of-input-args string from "--" to eof-str]'
      '(--exit, -x)'{--exit,-x}'[exit if the size (see --max-chars) is exceeded]'
      '--help[print summary and exit]'
      '(--interactive, -p)'{--interactive,-p}'[prompt before executing each command line]'
      '(--max-args, -n)'{--max-args=,-n+}'[use at most max-args arguments per command line]'
      '(--max-chars, -s)'{--max-chars=,-s+}'[use at most max-chars characters per command line]'
      '(--max-lines, -l)'{--max-lines=,-l+}'[use at most max-lines of the input-args per command line]'
      '(--max-procs, -P)'{--max-procs=,-P+}'[run up to max-procs command lines in the background at once]'
      '(--no-run-if-empty, -r)'{--no-run-if-empty,-r}'[do nothing if there are no input arguments before the eof-str]'
      '(--null, -0)'{--null,-0}'[split each input-arg at null bytes, for xargs compatibility]'
      '(--replace, -i)'{--replace=,-i}'[substitute replace-str in the initial-args by each initial-arg]'
      '(--verbose, -t)'{--verbose,-t}'[print each command line to stderr before executing it]'
      '--version[print the version number of zargs and exit]'
    )
    _arguments -S -s $arguments[@] && ret=0
  ;;
  1)
    #argument list for command
    _files && ret=0
  ;;
  *)
    #command and command arguments
    shift cmdpos words
    (( CURRENT -= cmdpos ))
    _normal
  ;;
esac

return ret
